From: Wietse Venema (wietseporcupine.org)
Date: Tue May 01 2007 - 10:05:11 CDT

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Hargis, Mandy:
> > ndd -get /dev/tcp tcp_keepalive_interval
> 7200000

On Solaris you don't need the patch. Postfix keepalives are already
turned on to work around kernel bugs.

However 7200000 milliseconds is two hours and that won't make a
difference of the problem is caused by NAT boxes with too short
timeouts. Try 10s and see if it makes a difference.

    ndd -set /dev/tcp tcp_keepalive_interval 10000

> I have not installed the Postfix patch that you provided in the separate
> message. I'm just wondering how my inbound SMTP servers could have been
> running for three + years without this patch or problem. How could it
> be necessary all of a sudden?

I suppose that if Postfix didn't change, then something else did.
Either this, or the problem already existed and you just didn't
know about it....

If you experience this problem with many sites, then it is
very likely that the problem is at your end of the world.

This is another reason why I suspect that something in your
infrastructure was changed recently.

        Wietse

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